Jakob Schelbert
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Recent activity by Jakob Schelbert-
Hi Tim, you could try using the simplex which always stays at a vertex of the polyhedron, but looking at your problem size barrier is probably faster (you can play around with the Method parameter,...
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Hi Aziz, See the documentation here: http://www.gurobi.com/documentation/8.1/refman/py_model_setobjectiven.html You do not have to specify the sense of the objective (you can set the overall sense ...
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Hi Velibor, As far as I know, the R-API does not permit adding lazy constraints. This is also true for the Matlab-API - both are more "matrix based" interfaces compared to the other APIs.
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Hi Christopher, Have you tried saving each model itself and later call model.write() on the relevant models, or is the (memory) overhead too big for this approach? Can you elaborate a bit more why ...
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Hi Andreas, some things caught my eye: your model is, I would say, a rather big one. 2.5m variables, 3.5m constraints and 14m non-zeros is something. However the numbers are halved after presolvin...
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Hi Luca, barrier is probably better known as interior point methods (https://en.wikipedia.org/wiki/Interior-point_method). The Wikipedia article contains some useful links to papers, for example fr...
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Hi Johannes, you could try to use cvxpy (https://www.cvxpy.org/examples/basic/quadratic_program.html) as an intermediate interface to gurobi. From what I've seen it should offer a similar interface...
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Hi Gabriel, my gurobi solves your model with objective 0. I've tested 8.1.0 and 8.1.1 - both yield the same (correct) result.Which platform do you use? Gurobi Optimizer version 8.1.0 build v8.1.0rc...
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Hi Johannes, I think the main reason why python does not provide a raw interface is that the high-level API is MUCH better in terms of debugging and extending a model while the overhead is minimal....
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Hi Ebru, I think you posted the log of the build process. Daniel meant the log file from the actual solving process. Something like this: x7101: 9222 rows, 7101 columns, 54642 nonzerosChanged value...